PHP Fatal error: Uncaught exception 'Exception' with message 'This document (/home/jmzeng/tmp/test_php/Rstudio_cheatsheets/advancedR.pdf) probably uses a compression technique which is not supported by the free parser shipped with FPDI. (See https://www.setasign.com/fpdi-pdf-parser for more details)' in /home/jmzeng/tmp/test_php/pdf_parser.php:322